Results 241 to 250 of about 274,920 (291)

Joint predistortion and transmit diversity

Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137), 2002
This paper presents a scheme for combining joint predistortion (JP) and transmit diversity (Tx diversity). JP is a new baseband processing technique applicable to TDD modems using combined time and code division multiple access. It eliminates intra cell interference at the base station transmitter, allowing for simple code matched filter detectors at ...
Frank Kowalewski, Peter Mangold
openaire   +1 more source

Transmit diversity and spatial multiplexing in four-transmit-antenna OFDM

IEEE International Conference on Communications, 2003. ICC '03., 2004
This paper studies a practical design for achieving both spatial diversity and spatial multiplexing in an OFDM system with four transmit antennas. In a certain range of spectral efficiency, the proposed hybrid space-time block coding/multiple-input multiple-output (STBC/MIMO) design is found to be a good design choice based on performance and receiver ...
Xiangyang Zhuang, Frederick W. Vook, Stéphanie Rouquette-Léveil, Karine Gosse   +3 more
openaire   +1 more source

Transmit diversity schemes for CDMA-2000

WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466), 2003
Transmit diversity offers an advantage in the forward link of the cdma2000 system by balancing the spectrum efficiency in the uplink and downlink. Three schemes for performing transmit diversity are examined in this paper-orthogonal transmit diversity, time switched transmit diversity, and selection transmit diversity for vehicular, indoor-outdoor ...
Dinesh Rajan, Steven D. Gray
openaire   +1 more source

Geolocation using transmit and receive diversity

IEEE Global Telecommunications Conference, 2004. GLOBECOM '04., 2005
Geolocation using received signal strength (RSS) has large errors due to multipath fading, since fading results in high variations in RSS. We show how and when spatial diversity combined with channel knowledge at the receiver can be used to combat fading effects to increase accuracy in location estimation.
Pulkit Grover, Rajiv Agarwal, Ajit Kumar Chaturvedi   +2 more
openaire   +1 more source

Transmit diversity as a combination of spatial and delay diversity

2000 IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications. ISSTA 2000. Proceedings (Cat. No.00TH8536), 2002
We present performance results of some of the algebraic space-time (ST) block codes based on the combination of Hadamard spreading sequences with rotated constellations. Given a vector x in a rotated constellation in dimension n that has full spatial diversity, we spread each component x/sub j/ of x by a different Hadamard sequence of length n and send
M.O. Damen, K. Abed-Meraim, null Teng Joon Lim   +2 more
openaire   +1 more source

Transmit diversity for arrays with correlated Rayleigh fading

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154), 2002
Transmit diversity is usually presented for the case of independently faded channels. In this paper the structure of a linear transmitter that can be optimized for a Rayleigh-fading environment in which the fading may be correlated is derived. The transmitter achieves the best mix of array gain-obtained by beamforming, and diversity gain-obtained by ...
Cornelius van Rensburg, Benjamin Friedlander   +1 more
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Transmit Diversity Schemes for WCDMA

Wireless Personal Communications, 2003
Previous work on transmitter antenna diversity has shown that the use of multiple transmitter antennas at the base station results in improved performance due to increase of diversity (path diversity). This happens with no bandwidth cost, even when the signal quality along several paths is poor, but the receiver estimates the channel with accuracy ...
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On transmit diversity for TD-SCDMA

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring., 2004
In TD-SCDMA (UMTS TDD 1.28 Mcps mode) advanced techniques such as closed loop transmit diversity (CLTD) are foreseen. Deployment of CLTD influences the choice of receiver architecture and depends on propagation conditions, mobile speed, feedback delay, antenna weight computation and quantization.
I. Held, A. Kerroum
openaire   +1 more source

Transmit diversity in the DFM system

2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010
Targeting to the DFM system, which is a digital version of FM and used in the VHF-FM band, the paper proposes a scheme of multimode OFDM-parameters design. The design can not only counteract the multi-path delay and Doppler shift of the DRM-Plus-related wireless channel, but also reduce the implementation complexity.
null Pengjun Wang, null Shuzheng Xu, null Huazhong Yang   +2 more
openaire   +1 more source

Integration of transmit power control, transmit diversity and receive beamforming

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2002
In this paper an algorithm for joint power control, transmit diversity and receive beamforming is proposed where transmit diversity and receive beamforming weight vectors and downlink power allocations are calculated jointly such that signal to interference ratio at each mobile is above threshold.
openaire   +1 more source